[Qgis-user] Understanding the rule-based renderer

[Sam Vekemans]

Hi,
Is their a list somewhere which shows all of the rendering rules which
people are using (the beginings of a standards system)?


Thanks,
Sam

On 4/8/11, Martin Dobias <wonder.sk at gmail.com> wrote:
> On Fri, Apr 8, 2011 at 11:36 AM, Andreas Neumann <a.neumann at carto.net>
> wrote:
>> Hi,
>>
>> I am trying to better understand the rule based renderer.
>>
>> Which version is correct?
>>
>> a) QGIS is rendering all features of the first rule, then the second rule,
>> etc, Features of the first rule are rendered first, features of the second
>> rule on top of features from the first rule
>> b) QGIS is rendering each feature on by one and decides which rule
>> applies.
>>
>> I hope it is not version b), I hoped it behaves like version a) but it
>> behaves a bit odd with my data. For my data it seems like the order of the
>> rule has no influence on the rendering order ;-(
>
> Hi Andreas
>
> the rule based renderer uses the b) option: it goes through the
> features one by one and applies all matching rules (in the order in
> which they appear). Mayeul Kaufmann has done some work in order to
> support option a) by implementing support for symbol levels so that
> the rendering order can be overridden.
>
> My ultimate goal is to only support the option a) in a way how SLD
> specifies it: rules are grouped and these groups are rendered one
> after each other.
>
> Regards
> Martin
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>


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